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Fault Probable cause
Abnormal noise when motor runs
Insulation paper of rotor and stator or slot wedge rubs.
There is foreign body as sand in oil or bearing wear.
Stator and rotor core loosen.
Bearing lack oil.
Air duct stuffing or fan rubs the fan housing.
Stator and rotor core rub.
Power voltage too high or imbalance.
Wrongly stator winding or short circuit.
Big motor vibration during running
Too big wear bearing clearance
Uneven air gap
Rotor imbalance
Revolving shaft bend.
Iron core deforms or loosens.
Housing or basic capacity is insufficient.
Motor foot screw loosen
Open circuit of cage rotor open welding, open circuit of wound
rotor, or winding fault with stator.
Bearing overheat.
Over much or few grease
Bad oil quantity and contains impurity.
Mismatch between bearing and journal or end cap(too loose or
too tight)
Eccentricity of bearing bore, rub with the axle.
Motor end cap or bearing cap not even assembled
Coupling between motor and load not adjust
Too large or too small bearing clearance
Motor axle bend.
Motor overheating or smoking
Too high power voltage, greatly increase the core heating.
Too low power voltage, the motor drives rated load, over large
current heats the winding.
When remove winding for overhaul, use improper way that
burn the iron core.
Rotor and stator core rub.
Motor overloads or start up frequently.
Cage rotor break.
Motor lacks phase, two phases run.
After rewinding, dipping paint of stator winding is improper.
In high temperature, much dirt on the motor surface or
ventilation duct block.
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